I am trying to download Adobe Reader 9 for a job to work from home and it downloads up to 93.3 % of the software and stops and gives me the message can not retrieve essential parameters. I do not know what that mean, what to do to get the software downloaded and I need this so I can continue the download for the software for the company...

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What version is the Adobe Acrobat Reader on your computer? If it is version 9 and you are trying to see the user guide from within a browser window (like Internet Explorer), you will have problems because of a known issue with Adobe Acrobat Reader 9. If the above is true, you will need to uninstall Adobe Acrobat Reader 9 and install Adobe Acrobat Reader version 8.1.3
(Click Here) to download for version 8.1.3. If you are unsure how th uninstall version 9 and install version 8.1.3, please post a response to this an I will give you details based on your operating system.

oddly enough, you may find that updating the version 8.0 you have to 8.x will then allow you to remove it (or it will work correctly) can you open the reader manually in the programs list? if so open it, then go to help and check for updates. apply the updates. If they work you should be in good shape.

Try to revome the old version by yourself, after that instal the new one.
If that dosent work, try to reinstal an old version first, then uninstal the same and instal the new one.
Seen this problem before, and one of the solutions obove should work for you.